KR101688504B1

KR101688504B1 - Additive composition for polymer modified asphalt, polymer modified asphalt composition comprising the same, and method for preparing the same

Info

Publication number: KR101688504B1
Application number: KR1020140089047A
Authority: KR
Inventors: 김재윤; 김태희; 정영민
Original assignee: 금호석유화학 주식회사
Priority date: 2014-07-15
Filing date: 2014-07-15
Publication date: 2016-12-22
Also published as: KR20160008825A; US9862820B2; US20160017139A1

Abstract

According to an aspect of the present invention, there is provided a first copolymer compound having a radial structure represented by the following formula (1); And a second copolymer compound represented by the following general formula (2).
[Chemical Formula 1]
(AB) _n X
(2)
AB-B'-A '
Wherein A and A 'are aromatic vinyl compounds having different molecular weights, B and B' are conjugated diene compounds, n is one of integers from 3 to 6, X is a coupling agent, Lt; / RTI >

Description

FIELD OF THE INVENTION [0001] The present invention relates to an additive composition for asphalt, a modified asphalt composition containing the modified asphalt composition, and a method for producing the modified asphalt composition,

The present invention relates to an additive composition for modified asphalt, a modified asphalt composition containing the modified asphalt composition, and a method for producing the modified asphalt composition. More particularly, the present invention relates to an additive composition for asphalt which can improve the processing and packaging performance by lowering the viscosity while maintaining physical properties of the modified asphalt A modified asphalt composition, and a process for producing the same.

Asphalt is generally composed of more than a few thousand polymer hydrocarbons (C-H) and is a thermoplastic material, which is phase-changed into liquid phase when heated. Such asphalt is used as a bonding material or an adhesive material because of its excellent adhesiveness and excellent adhesion with a mineral material. Also, since it is not soluble in water and impermeable, it is also used as a waterproof material and its viscosity can be changed according to the purpose of use, and thus it is used for various applications such as road packing, waterproofing, general industrial use and agricultural use.

Asphalt is used as a material for heated asphalt mixture, mainly used for road pavement, and acts as a binder to bind aggregates and aggregates well. Asphalt used for road paving is generally used as a straight asphalt with excellent extensibility and adhesiveness. However, due to the low softening point of the asphalt, weak weatherability, and low cohesive strength, plastic deformation at high temperature or cracking occurs at low temperature. In order to solve these problems, researches on asphalt modifiers or additives have been actively conducted.

Examples of such asphalt modifiers include rubber series, thermoplastic series, thermosetting series, hydrocarbon series, filler series, fiber series, antioxidant and reducing agent. Rubber series include natural rubber, styrene butadiene rubber (SBR), and crumb rubber. Thermoplastic resins include styrene butadiene styrene (SBS), ethylene vinylacetate (EVA), polyethylene (PE) Polyvinylchloride (PVC) and Polyethylene Terephthalate (PET). Thermosetting resins include epoxy resins, urethane resins, acrylic resins, phenolic resins, and petroleum resins. Hydrocarbons include natural asphalt.

Of these, aromatic compounds such as aromatic vinyl hydrocarbon-conjugated diene block copolymers such as styrene butadiene styrene block copolymer (SBS) are known to be effective for improving high-temperature and low-temperature properties. SBS is a copolymer of soft butadiene block and rigid styrene block. When SBS is dissolved in asphalt at high temperature, the viscosity and elasticity of asphalt increases, so that resistance to plastic deformation increases at high temperature, flexibility at low temperature increases, and resistance to low temperature crack increases.

However, since the melting temperature of SBS is high, a high shear mixer, which is a special mixer, should be used for mixing with asphalt and mixed for a long time at a high temperature of 160 ° C or higher. That is, when SBS is used as an additive, the viscosity of the asphalt composition increases, and the energy consumption during manufacture and pavement may be excessive. In addition, since SBS has low affinity for asphalt, the modified asphalt can be separated into a non-uniform phase.

To solve this problem, a small amount (less than 5% by weight) of sulfur as a phase separation stabilizer is added to the modified asphalt. However, when sulfur is added, not only the viscosity of the asphalt composition increases, but also harmful substances such as sulfur oxides may be discharged.

Accordingly, there is a demand for development of an additive composition for modified asphalt which can reduce the amount of sulfur added during the production of the modified asphalt composition and maintain the physical properties of the conventional modified asphalt with a low viscosity.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and an object of the present invention is to provide a process for producing a modified asphalt composition, which is capable of reducing the amount of sulfur added, A modified asphalt composition containing the modified asphalt composition, and a process for producing the modified asphalt composition.

In order to accomplish the above object, one aspect of the present invention provides a radiation curable resin composition comprising: a first copolymer compound having a radial structure represented by the following formula (1); And a second copolymer compound represented by the following general formula (2).

[Chemical Formula 1]

(AB) _n X

(2)

A-B-B'-A '

Wherein A and A 'are aromatic vinyl compounds having different molecular weights, B and B' are conjugated diene compounds, n is one of integers from 3 to 6, X is a coupling agent, Lt; / RTI >

In one embodiment, the content of the first copolymer compound may be 5 to 50% by weight based on the total weight of the additive composition for modified asphalt.

In one embodiment, the molecular weight of the first copolymer compound may be greater than the molecular weight of the second copolymer compound and less than twice the molecular weight of the second copolymer compound.

In one embodiment, the molecular weight of A 'may be greater than the molecular weight of A and less than twice the molecular weight of A.

In one embodiment, the aromatic vinyl compound is selected from the group consisting of styrene,? -Methylstyrene, o-methylstyrene, p-methylstyrene, p-tert-butylstyrene, It can be one.

In one embodiment, the vinyl content in B and B 'may each be 10 to 50 mol% (mol%).

In one embodiment, the conjugated diene-based compound may be one selected from the group consisting of 1,3-butadiene, isoprene, and a unit moiety wherein at least one of them is polymerized.

In one embodiment, the coupling agent may be a diester compound, a triester compound, or a mixture thereof.

In one embodiment, the coupling agent is selected from the group consisting of dialkyl carbonates, dialkyl malonates, dialkyl phthalates, dialkyl succinates, dialkyl glutarates, dialkyl adipates, dialkyl pimelates, Alkyl benzoate, alkyl sebacate, dialkyl azelate, dialkyl biscylate, dialkyl tetradecanedioate, dicarboxylate, tricarboxylate, and mixtures of two or more thereof.

According to another aspect of the present invention, there is provided an asphalt pavement comprising: an asphalt; And an additive composition for the modified asphalt.

In one embodiment, the weight ratio of the asphalt and the modified asphalt additive composition may be 100 parts by weight: 1 to 10 parts by weight.

According to another aspect of the present invention, there is provided a method for preparing a living anionic polymer, which comprises polymerizing an aromatic vinyl compound and a conjugated diene compound to prepare a living anionic polymer; Reacting a part of the living anionic polymer with a coupling agent to prepare a first copolymer compound having a radial structure represented by the following formula (1); And a step of polymerizing a conjugated diene compound and an aromatic vinyl compound sequentially on the remaining part of the living anionic polymer to prepare a second copolymer compound represented by the following formula (2) to provide.

[Chemical Formula 1]

(AB) _n X

(2)

A-B-B'-A '

According to one aspect of the present invention, by using an additive composition for modified asphalt comprising an aromatic vinyl compound-conjugated diene compound copolymer and a radial block copolymer having different molecular weights at both ends thereof during the production of the modified asphalt composition, It is possible to maintain the physical properties of the conventional modified asphalt while reducing the addition amount of sulfur, and to lower the viscosity and enhance the processing and packaging performance.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a schematic view illustrating a method of manufacturing an additive composition for modified asphalt according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" . Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Additive composition for modified asphalt

According to an aspect of the present invention, there is provided a first copolymer compound having a radial structure represented by the following formula (1); And a second copolymer compound represented by the following general formula (2).

[Chemical Formula 1]

(AB) _n X

(2)

A-B-B'-A '

In the first copolymer compound, three, four, five, or six (AB) diblock copolymers, specifically, (AB) living anionic polymers, depending on the number of functional groups contained in the coupling agent, Bonded or coupled.

The residue (X) of the coupling agent is derived from a coupling agent and can be produced by a coupling reaction of the coupling agent and the polymer.

In one embodiment, the content of the first copolymer compound may be 5 to 50% by weight based on the total weight of the additive composition for modified asphalt. When the content of the first copolymer compound having a radial structure is less than 5% by weight, the viscosity reduction effect of the modified asphalt composition is weak and the energy consumption during packaging may be excessive. If the content of the first copolymer compound exceeds 50% by weight, the physical properties of asphalt such as softening point, Can be degraded.

The content of the first copolymer compound in the modified asphalt additive composition may be determined depending on the dosage of the coupling agent, and the amount of the coupling agent may be adjusted before the conjugated diene compound is administered after the coupling agent is administered, A small amount of the composition can be sampled and confirmed by gel permeation chromatography (GPC), which is calibrated with standard polystyrene.

As used herein, the term "GPC " refers to a method or apparatus capable of measuring the time at which a target material passes through a column and measuring the molecular weight of the polystyrene exiting the column at the same time, by the molecular weight of the target material.

In one embodiment, the molecular weight of the first copolymer compound may be greater than the molecular weight of the second copolymer compound and less than twice the molecular weight of the second copolymer compound. If the molecular weight of the first copolymer compound having a radial structure is less than the molecular weight of the second copolymer compound, the mechanical properties such as elongation of the asphalt may be deteriorated. If the molecular weight of the second copolymer compound is more than 2 times the molecular weight of the second copolymer compound, May be weak.

In one embodiment, the molecular weight of the A '(an aromatic vinyl compound, a unit in which a monomer or a monomer is polymerized) is larger than a molecular weight of the A (an aromatic vinyl compound, a unit in which a monomer or a monomer is polymerized) Of the molecular weight. If the molecular weight of the monomers or units located at both ends is the same as that of the styrenic block copolymer used as the additive for conventional modified asphalt, the viscosity can be lowered. However, since the softening point of the asphalt is lowered, It is preferable to adjust the molecular weight of A 'within the above range.

As used herein, the term "molecular weight" may be interpreted differently depending on the type of A or A '. Specifically, the "molecular weight" means the molecular weight of one monomer if A or A 'is an aromatic vinyl compound monomer, and if A or A' is a unit moiety polymerized with such a monomer, the weight average molecular weight (Mw ).

In one embodiment, the aromatic vinyl compound is selected from the group consisting of styrene,? -Methylstyrene, o-methylstyrene, p-methylstyrene, p-tert-butylstyrene, And preferably styrene having a low steric hindrance may be used.

In one embodiment, the content of vinyl (vinyl) in the above B (conjugated diene compound, unit of monomer or monomer is polymerized) and B '(conjugated diene compound, unit of monomer or monomer is polymerized) May each be 10 to 50 mol%, and preferably 20 to 50 mol%. If the vinyl content is less than 10 mol%, the phase separation of the additive in the modified asphalt composition may occur excessively, and the viscosity reduction effect may be weak. On the other hand, when the vinyl content is more than 50 mol%, the amount of the Lewis base to be added at the time of polymerization becomes excessive, so that the production cost is increased and the mechanical properties of the asphalt such as elongation may be deteriorated.

In one embodiment, the conjugated diene-based compound may be one selected from the group consisting of 1,3-butadiene, isoprene, and a unit moiety wherein at least one of them is polymerized. Preferably, 1,3-butadiene having a low steric hindrance as in the styrene can be used.

In one embodiment, the coupling agent may be a diester compound, a triester compound, or a mixture thereof. Non-limiting examples of such coupling agents that can be used include dialkyl carbonates, dialkyl malonates, dialkyl phthalates, dialkyl succinates, dialkyl glutarates, dialkyl adipates, dialkyl pimelates, dialkyl bevelates, A dialkyl sebacate, a dialkyl sebacate, a dialkyl tetradecanedioate, a dicarboxylate, a tricarboxylate, and a mixture of two or more thereof. Preferably, it may be a dialkyl sebacate, which is a diester, more preferably dibutyl sebacate.

Modified asphalt composition

Another aspect of the present invention relates to asphalt; And an additive composition for the modified asphalt.

The kind of the above-mentioned asphalt is not particularly limited, and it may include both natural and oil-derived asphalt. In particular, petroleum-based asphalt, straight asphalt, asphalt cement, or blown asphalt may be used.

In one embodiment, the weight ratio of the asphalt and the modified asphalt additive composition may be 100 parts by weight: 1 to 10 parts by weight. If the weight ratio of the additive composition for modified asphalt is less than 1 part by weight, the polymer performance as a modifier is difficult to manifest due to the low concentration of the polymer in the asphalt composition. If the amount is more than 10 parts by weight, the viscosity at high temperature increases, The flowability may be deteriorated, and dispersion may be delayed, resulting in thermal decomposition of the asphalt binder and mechanical decomposition due to shear stress.

On the other hand, sulfur may be mixed to suppress phase separation during the production of the modified asphalt composition. The amount of sulfur to be added may be 0.1 to 20 parts by weight, preferably 0.1 to 10 parts by weight based on 100 parts by weight of the modified asphalt additive composition. If the dose of sulfur is more than 20 parts by weight, phase separation due to gelation may occur and the amount of harmful substances containing sulfur components may increase, so that it is preferable to maintain the above range.

Further, the modified asphalt composition may further comprise a vegetable wax as an additional modifier. The vegetable wax can reduce the high temperature viscosity of the modified asphalt composition and can further improve the low temperature properties as compared with the polyethylene wax added as the conventional modifier. The type of the vegetable wax which can be used is not particularly limited, and any wax raw material such as hydrogenated vegetable wax or modified vegetable wax can be used as long as it is obtained from a natural product. In particular, palm wax extracted from coconut oil may be used in view of commercial availability, in which case the melting temperature of the palm wax is approximately 60 ° C.

Further, a modified wax in which the physical properties of the wax are partially improved may be used. In particular, a palm wax modified with sodium hydroxide may be used, wherein the modified palm wax has a melting temperature of approximately 80 ° C to 110 ° C.

METHOD FOR PREPARING ADDITIVE ADHESIVE COMPOSITION FOR ASFTA

Referring to FIG. 1, a method for preparing an additive composition for modified asphalt according to another aspect of the present invention comprises: (S100) preparing a living anionic polymer by polymerizing an aromatic vinyl compound and a conjugated diene compound; A step S200 of reacting a part of the living anionic polymer with a coupling agent to prepare a first copolymer compound having a radial structure represented by the following formula (1); And a step (S300) of preparing a second copolymer compound represented by the following formula (2) by sequentially polymerizing a conjugated diene compound and an aromatic vinyl compound in the remaining part of the living anionic polymer.

[Chemical Formula 1]

(AB) _n X

(2)

A-B-B'-A '

Each of the steps disclosed in the above production method may be carried out in a single reactor and may be carried out using two or more reactors in each step as required.

In step (S100) of producing the living anionic polymer, the aromatic vinyl compound A and the conjugated diene compound B may be polymerized to prepare the (A-B) diblock copolymer.

As described above, A and B may be an aromatic vinyl compound monomer or a conjugated diene compound monomer, and the aromatic vinyl compound monomer may be polymerized to a certain level, or the conjugated diene compound monomer may be polymerized at a certain level, It is possible. Preferably, A and B may be unit parts in which the monomer is polymerized at a certain level so that the molecular weight or structure of the first and second copolymer compounds can be easily analyzed.

Specifically, after an aromatic vinyl compound unit (A) is polymerized by charging an organic solvent, an aromatic vinyl compound monomer, and an organolithium initiator into a single reactor, the conjugated diene compound monomer and the Lewis base are added to the conjugated diene compound unit The (AB) diblock copolymer can be prepared by further polymerizing the part (B).

In the polymerization of the conjugated diene-based compound unit (B), the initiation temperature may be 10 to 50 ° C. If the initiation temperature is less than 10 ° C, the reaction rate is disadvantageous. If the initiation temperature is more than 50 ° C, it is difficult to control the vinyl content through the Lewis base, which is disadvantageous in terms of polymerization temperature control.

The organic solvent may be one selected from the group consisting of aliphatic hydrocarbon series, cyclic aliphatic hydrocarbon series, aromatic hydrocarbon series, and mixtures of two or more thereof, preferably n-pentane, n-hexane, n But may be any one selected from the group consisting of heptane, isooctane, cyclohexane, toluene, benzene, xylene, and mixtures of two or more thereof, more preferably cyclohexane, but is not limited thereto .

The organolithium initiator may be an alkyllithium compound, preferably an alkyllithium compound having an alkyl group of 3 to 10 carbon atoms, preferably methyllithium, ethyllithium, isopropyllithium, n-butyllithium, sec -Butyllithium, tert-butyllithium, and mixtures of two or more thereof. More preferably, it may be n-butyllithium or sec-butyllithium, but is not limited thereto no.

Wherein the Lewis base is selected from the group consisting of tetrahydrofuran, diethyl ether, diethylene glycol dimethyl ether, ditetrahydrofuryl propane, triethylamine, N, N, N, N-tetramethylethylenediamine, And preferably tetrahydrofuran, but it is not limited thereto. The dose of the Lewis base can be adjusted according to the molar number of the total anion and the vinyl content in the target conjugated diene compound at the initiation temperature condition. The vinyl content in the conjugated diene compound B (or B ') is as described above.

The produced (A-B) diblock copolymer is a living anionic polymer, and can further cause a chain polymerization reaction with the other monomer or unit moiety.

In step S200 of producing the first copolymer compound, a radial copolymer compound may be prepared by reacting a part of the living anionic polymer (A-B) with a coupling agent containing n functional groups. The kind of the coupling agent usable, the dose, and thus the content of the first copolymer compound are as described above.

(B ') and an aromatic vinyl compound (A') are sequentially polymerized in the remaining part of the living anionic polymer (AB) in the step (S300) of producing the second copolymer compound, A co-compound can be prepared.

The (A-B) diblock copolymer remaining in the reactor after preparing the radial copolymer compound by a coupling reaction may also be a living anionic polymer capable of further chain-polymerizing with the other monomer or unit.

(AB-B ') triblock copolymer in which a conjugated diene compound unit unit (B') was further polymerized by administering a conjugated diene compound monomer to a living anionic polymer remaining in an organic solvent in a single reactor (AB-B'-A ') tetrablock copolymer prepared by further polymerizing an aromatic vinyl compound unit unit (A') by administering an aromatic vinyl compound monomer, have.

On the other hand, all the polymerization reactions in each step according to one embodiment can be performed under an inert gas such as nitrogen or argon, and the polymerization temperature can be 0 to 100 ° C. It can be stored under a certain pressure of an inert gas so that moisture and oxygen do not come into contact with the air even when the polymerization is completed.

When the preparation of the first and second copolymer compounds is completed, the living anionic polymer remaining in the reactor can be deactivated by introducing polymerization terminating agents such as water, alcohol and organic-inorganic acid, preferably methanol, into the polymerization terminating agent .

Hereinafter, embodiments of the present invention will be described in detail. The following examples are only illustrative of the present invention, and the scope of the present invention is not limited thereto.

Example : Preparation of additive composition for modified asphalt

Styrene and butadiene were selected as monomers, and these were polymerized to prepare an additive composition for modified asphalt comprising the radial copolymer compound of Formula 1 and the chained copolymer compound of Formula 2. Dibutyl sebacate, cyclohexane, n-butyl lithium, and tetrahydrofuran were used as coupling agent, organic solvent, organolithium initiator, and Lewis base, respectively.

Example One

2L pressure-resistant reactor was sufficiently replaced with argon (Ar) gas. 900 g of refined cyclohexane, 0.9 g of tetrahydrofuran (THF) and 29 g of styrene monomer were charged and the temperature was maintained at 50 캜. 0.8 mL (n-butyllithium (BuLi) as an initiator (cyclohexane solution of 2M concentration) was added to the reactor to initiate the polymerization reaction. After 10 minutes from the time when the polymerization temperature of the styrene monomer reached the maximum temperature, 56 g of butadiene monomer was added and polymerized. After 5 minutes from the time when the butadiene polymerization temperature reached the maximum temperature, 20 mg of dibutyl sebacate was added to the reactor, Ring reaction.

After 5 minutes from the introduction of the coupling agent, 84 g of butadiene monomer was further added to polymerize. After 5 minutes from the point when the polymerization temperature of the butadiene monomer reached the maximum temperature, 31 g of styrene monomer was further added to polymerize. Methanol as a polymerization terminator was added to completely remove the activity of the living anionic polymer remaining in the polymerization solution. Thereafter, an antioxidant was added to the polymerization solution in which the reaction was terminated, and cyclohexane was removed using a roll mill to obtain an additive composition for modified asphalt.

Example 2

The additive composition for modified asphalt was prepared in the same manner as in Example 1, except that 30 mg of dibutyl sebacate, which is a coupling agent, was added.

Example 3

The additive composition for modified asphalt was prepared in the same manner as in Example 1, except that 35 mg of dibutyl sebacate, which is a coupling agent, was added.

Example 4

An additive composition for modified asphalt was prepared in the same manner as in Example 1, except that 40 mg of dibutyl sebacate, which is a coupling agent, was added.

Example 5

An additive composition for modified asphalt was prepared in the same manner as in Example 1, except that 60 mg of dibutyl sebacate, which is a coupling agent, was added.

Comparative Example : Preparation of additive composition for modified asphalt

Comparative Example One

2L pressure-resistant reactor was sufficiently replaced with argon (Ar) gas. 900 g of refined cyclohexane, 0.9 g of tetrahydrofuran (THF) and 60 g of styrene monomer were charged, and the temperature was maintained at 50 캜. 1.6 mL of n-butyllithium (BuLi) as an initiator (cyclohexane solution of 2M concentration) was added to the reactor to initiate the polymerization reaction. After 10 minutes from the time when the polymerization temperature of the styrene monomer reached the maximum temperature, 140 g of butadiene monomer was added and polymerized. After 5 minutes from the time when the butadiene polymerization temperature reached the maximum temperature, 0.33 g of dimethyldichlorosilane was added to the reactor, Ring reaction.

Methanol as a polymerization terminator was added to completely remove the activity of the living anionic polymer remaining in the polymerization solution. Thereafter, an antioxidant was added to the polymerization solution in which the reaction was terminated, and cyclohexane was removed using a roll mill to obtain an additive composition for modified asphalt.

Comparative Example 2

2L pressure-resistant reactor was sufficiently replaced with argon (Ar) gas. 900 g of refined cyclohexane, 0.9 g of tetrahydrofuran (THF) and 32 g of styrene monomer were charged, and the temperature was maintained at 50 캜. 0.8 mL (n-butyllithium (BuLi) as an initiator (cyclohexane solution of 2M concentration) was added to the reactor to initiate the polymerization reaction. After 10 minutes from the time when the polymerization temperature of the styrene monomer reached the maximum temperature, 53 g of butadiene monomer was added and polymerized. After 5 minutes from the time when the butadiene polymerization temperature reached the maximum temperature, 30 mg of dibutyl sebacate was added to the reactor, Ring reaction.

After 5 minutes from the introduction of the coupling agent, 87 g of butadiene monomer was further added to polymerize. After 5 minutes from the time when the polymerization temperature of the butadiene monomer reached the maximum temperature, 28 g of styrene monomer was further added to polymerize. Methanol as a polymerization terminator was added to completely remove the activity of the living anionic polymer remaining in the polymerization solution. Thereafter, an antioxidant was added to the polymerization solution in which the reaction was terminated, and cyclohexane was removed using a roll mill to obtain an additive composition for modified asphalt.

Comparative Example 3

An additive composition for modified asphalt was prepared in the same manner as in Example 1, except that 10 mg of tetrachlorosilane was added as a coupling agent.

Comparative Example 4

An additive composition for modified asphalt was prepared in the same manner as in Example 1, except that 7 mg of dibutyl sebacate, which is a coupling agent, was added.

Comparative Example 5

An additive composition for modified asphalt was prepared in the same manner as in Example 1, except that 140 mg of dibutyl sebacate, which is a coupling agent, was added.

In short, in Comparative Example 1, the styrene-butadiene copolymer used as an additive for conventional modified asphalt was 85% (coupling ratio) of the triblock copolymer resulting from the use of dichlorodimethylsilane as the coupling agent, and the remaining And 15% of a styrene-butadiene diblock copolymer. In Comparative Example 2, the dosage of styrene and butadiene was adjusted so as to polymerize styrene block A and styrene block A 'so that the molecular weights thereof were the same. In Comparative Example 3, tetrachlorosilane was used as the coupling agent. In Comparative Examples 4 and 5, the same polymerization process as in Examples 1 to 5 was carried out, and the content of the first copolymer compound was controlled by adjusting the amount of the coupling agent.

The qualitative analysis results of the additives for modified asphalt according to Examples 1 to 5 and Comparative Examples 1 to 5 are shown in Table 1 below.

Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 First copolymer coupling rate (wt%) 10.2 14.7 16.1 19.8 31.1 0 15.3 15.5 3.4 68.7 A Molecular weight (g / mol) 14,500 15,000 13,000 14,500 13,800 16,500 16,100 13,200 15,800 15,100 The amount of the second copolymer block (g / mol) 109,000 117,000 99,000 113,000 104,000 115,000 110,000 105,000 109,000 110,000 A 'molecular weight (g / mol) 18,000 21,000 17,000 20,000 18,000 16,500 16,100 18,000 17,500 17,100 B and B '
Vinyl content (mol%) 34.2 33.3 34.2 32.8 32.6 12.1 33.3 32.9 33.1 33.1 Total molecular weight (g / mol) 118,000 127,000 108,000 123,000 113,000 115,000 120,000 110,000 112,000 123,000 Styrene gun
Content (wt%) 30.0 30.8 29.8 30.1 30.3 30.0 30.3 30.6 29.9 30.7

In Table 1, the coupling ratio of the first copolymer compound is a percentage of the weight of the first copolymer compound with respect to the total weight of the additive composition for modified asphalt. The molecular weight (weight average molecular weight, Mw) of the styrene block A can be calculated from the molar amount of the alkyllithium as a reaction initiator and the amount of the styrene monomer, or can be measured by gel permeation chromatography after the polymerization of the styrene monomer, have. The molecular weight (weight average molecular weight, Mw) of the styrene block A 'can be calculated from the molar number of the anion of the styrene-butadiene block copolymer remaining after the coupling reaction and the amount of the styrene monomer. In addition, the vinyl content of the butadiene block copolymer (B or B ') and the total content of styrene in the additive composition for modified asphalt can be obtained through a nuclear magnetic resonance (NMR) analysis after completion of the polymerization.

Experimental Example 1: Comparison of properties of modified asphalt composition

4.5 parts by weight of the additive composition for modified asphalt according to the above Examples 1 to 5 and Comparative Examples 1 to 3 were added to 100 parts by weight of the asphalt to prepare a modified composition according to Production Examples 1 to 5 and Comparative Examples 1 to 3 An asphalt composition was prepared. The softening point, elongation, and high temperature (160 캜) viscosity of the modified asphalt composition were measured and the results are shown in Table 2 below. The softening point was measured according to ASTM D36 and elongation was measured according to ASTM D113 at a temperature of 5 ° C ± 0.5 ° C and a separation rate of 5 cm / min ± 0.5%. The viscosity was measured at 160 ° C using a rotational viscometer.

Production Example 1 Production Example 2 Production Example 3 Production Example 4 Production Example 5 compare
Production Example 1 compare
Production Example 2 compare
Production Example 3 compare
Production Example 4 compare
Production Example 5 Softening point (℃) 72.7 73.2 72.9 71.5 69.7 72.8 65.1 73.9 73.1 59.1 Shindo
(cm) Before thin film heating 42.1 43.2 42.5 41.5 40.2 41.5 35.3 39.2 42.6 28.9 After thin film heating 13.2 13.8 13.4 12.9 12.1 12.9 12.5 12.6 13.4 8.5 Viscosity (160 캜, cps) 435 421 418 406 394 475 462 460 480 332

Referring to Table 2, it was found that the modified asphalt compositions of Production Examples 1 to 5, which partially contained the radial first copolymer compound by the coupling reaction, had a higher viscosity than Comparative Preparation Example 1 which did not contain the first copolymer compound at all Is low. Compared with Comparative Preparation Example 2, in which the molecular weights of A and A 'units located at both ends of the second copolymer compound are the same, the viscosity is low, . Comparative Preparation Example 3 in which tetrachlorosilane was used as the coupling agent contained the first copolymer compound, but the viscosity reduction effect was weaker than those of Production Examples 1 to 5 in which dibutyl sebacate was applied.

On the other hand, when comparing the modified asphalt compositions of Production Examples 1 to 5 with those of Comparative Production Examples 4 to 5, it was found that the viscosity reduction effect was insignificant when the coupling ratio of the first copolymer compound was less than 5% by weight (3.4% If it exceeds 68% by weight, the mechanical properties such as softening point and elongation are drastically deteriorated.

Experimental Example 2: Comparison of properties of modified asphalt composition containing sulfur

4.5 parts by weight of the additive composition for modified asphalt of Example 1 and 0.1 part by weight of sulfur were added to 100 parts by weight of asphalt to prepare a modified asphalt composition according to Production Example 6 at 160 캜. Comparative Preparation Example 6 was a modified asphalt composition prepared by adding 4.5 parts by weight of the additive composition for modified asphalt of Comparative Example 1 and 0.18 part by weight of sulfur. In Comparative Preparation Example 7, except that 0.1 part by weight of sulfur was added, Modified asphalt composition prepared in the same manner as in Comparative Production Example 6. [ The softening point, elongation, and high temperature (160 ° C) viscosity of the modified asphalt composition were measured and the results are shown in Table 3 below. The softening point was measured according to ASTM D36 and elongation was measured according to ASTM D113 at a temperature of 5 ° C ± 0.5 ° C and a separation rate of 5 cm / min ± 0.5%. The viscosity was measured at 160 ° C using a rotational viscometer.

Production Example 6 Comparative Preparation Example 6 Comparative Preparation Example 7 Sulfur charge (parts by weight) 0.1 0.18 0.1 Softening point (℃) 83.7 83.9 76.1 Shindo
(cm) Before thin film heating 34.5 30.2 28.3 After thin film heating 17.8 15.0 14.1 Viscosity (160 캜, cps) 570 730 630

Referring to Tables 2 and 3, the modified asphalt compositions of Production Example 6 and Comparative Production Examples 6 to 7 exhibited increased softening points and longer elongation after heating than those of Production Example 1 and Comparative Production Example 1, , And the viscosity is increased. However, even when the viscosity was increased to some extent, the viscosity of Production Example 6 was still the lowest, and even when a small amount of sulfur was added to the modified asphalt composition of Production Example 6, it was confirmed that the product had excellent physical properties as compared with those of Comparative Production Examples 6 to 7 Respectively.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

Claims

A first copolymer compound having a radial structure represented by the following formula (1); And a second copolymer compound represented by the following formula (2)
Wherein the content of the first copolymer compound is from 5 to 50% by weight, based on the total weight of the first and second copolymer compounds, of an additive composition for modified asphalt:
[Chemical Formula 1]
(AB) _n X
(2)
AB-B'-A '
In the above formulas (1) and (2)
A and A 'are unit parts obtained by polymerizing an aromatic vinyl monomer having a different molecular weight,
B is a unit moiety in which a conjugated diene monomer is polymerized,
B 'is a unit moiety in which the additional conjugated diene monomer is polymerized in B,
n is one of integers from 3 to 6,
X is the residue of the coupling agent.

delete

The method according to claim 1, wherein the weight-average molecular weight (Mw) of the first copolymer compound is greater than the weight average molecular weight of the second copolymer compound and not more than twice the weight average molecular weight of the second copolymer compound Additive composition.

The additive composition for modified asphalt according to claim 1, wherein the weight average molecular weight (Mw) of the A 'is larger than the weight average molecular weight of the A and not more than twice the weight average molecular weight of the A.

The additive composition for modified asphalt according to claim 1, wherein the aromatic vinyl monomer is at least one selected from the group consisting of styrene,? -Methylstyrene, o-methylstyrene, p-methylstyrene, and p-tert-butylstyrene.

The additive composition for modified asphalt according to claim 1, wherein the vinyl content in B and B 'is 10 to 50 mol% (mol%), respectively.

The additive composition for modified asphalt according to claim 1, wherein the conjugated diene-based monomer is at least one selected from the group consisting of 1,3-butadiene and isoprene.

The additive composition for modified asphalt according to claim 1, wherein the coupling agent is a diester compound, a triester compound, or a mixture thereof.

The method of claim 1, wherein the coupling agent is selected from the group consisting of dialkyl carbonates, dialkyl malonates, dialkyl phthalates, dialkyl succinates, dialkyl glutarates, dialkyl adipates, dialkyl pimelates, Which is one selected from the group consisting of alkyl sulfates, alkyl sebacates, dialkyl azelates, dialkyl brassylates, dialkyl tetradecanedioates, dicarboxylates, tricarboxylates, and mixtures of two or more thereof Additive composition.

asphalt; And
10. A modified asphalt composition comprising the additive composition for modified asphalt according to any one of claims 1 to 9.

11. The modified asphalt composition according to claim 10, wherein the weight ratio of the asphalt and the additive composition for modified asphalt is 100 parts by weight: 1 to 10 parts by weight.

Polymerizing a unit in which an aromatic vinyl monomer is polymerized and a unit in which a conjugated diene monomer is polymerized to prepare a living anion polymer;
Reacting a part of the living anionic polymer with a coupling agent to prepare a first copolymer compound having a radial structure represented by the following formula (1); And
And polymerizing a unit in which a conjugated diene monomer is polymerized and a unit in which a conjugated diene monomer is polymerized, in the remainder of the living anionic polymer, to prepare a second copolymer compound represented by the following formula (2)
Wherein the content of the first copolymer compound is 5 to 50 wt% based on the total weight of the first and second copolymer compounds.
[Chemical Formula 1]
(AB) _n X
(2)
AB-B'-A '
In the above formulas (1) and (2)
A and A 'are unit parts obtained by polymerizing an aromatic vinyl monomer having a different molecular weight,
B is a unit moiety in which a conjugated diene monomer is polymerized,
B 'is a unit moiety in which the additional conjugated diene monomer is polymerized in B,
n is one of integers from 3 to 6,
X is the residue of the coupling agent.

delete

The method as claimed in claim 12, wherein the first copolymer compound has a weight average molecular weight (Mw) greater than the weight average molecular weight of the second copolymer compound and not more than twice the weight average molecular weight of the second copolymer compound &Lt; / RTI >

The method for producing an additive composition for modified asphalt according to claim 12, wherein the weight average molecular weight (Mw) of A 'is larger than the weight average molecular weight of A and not more than twice the weight average molecular weight of A.

The additive composition for modified asphalt according to claim 12, wherein the aromatic vinyl monomer is at least one selected from the group consisting of styrene,? -Methylstyrene, o-methylstyrene, p-methylstyrene, and p-tert- Gt;

13. The method for producing an additive composition for modified asphalt according to claim 12, wherein the vinyl content in B and B 'is 10 to 50 mol% (mol%), respectively.

The method for producing an additive composition for modified asphalt according to claim 12, wherein the conjugated diene monomer is at least one selected from the group consisting of 1,3-butadiene and isoprene.

The method for producing an additive composition for modified asphalt according to claim 12, wherein the coupling agent is a diester compound, a triester compound, or a mixture thereof.

The method of claim 12, wherein the coupling agent is selected from the group consisting of dialkyl carbonates, dialkyl malonates, dialkyl phthalates, dialkyl succinates, dialkyl glutarates, dialkyl adipates, dialkyl pimelates, Which is one selected from the group consisting of alkyl sulfates, alkyl sebacates, dialkyl azelates, dialkyl brassylates, dialkyl tetradecanedioates, dicarboxylates, tricarboxylates, and mixtures of two or more thereof &Lt; / RTI >